Sewing-machine.



vA. H DE v05. SEWING MACHINE. APPLICATION FILED OCT. 25, I912.

1,140,581 Patented May 25, 1915.

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A TTOR/VEY THE NORRIS PETERS 00.. PHOTT LITHO.. WASHINGTON, D. C.

A. H. DE VOE. SEWING MACHINE.

APPLICATION FILED OCT- 25. IQIZ- 1,140,581 Patented May 25, 1915.

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W/T/VESSES: INVENTOR uflerzflfi0 Way M j fjpmw ATTORNEY THE NORRIS PETERS CD-. FHOTO-LITHO" WASHINGr ALBERT H. DE VOE, 0F WESTFIELD, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented May 25, 1915.

Application filed October 25, 1912. Serial No. 727,638.

To all whom it may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines, especially such machines vas are employed for effecting a zigzag or the requirements of a given maximum length of stitch, the length depending in a measure on the thickness of the material acted upon, and when it is desired to exceed the length of the stitch originally intended, it is essential that an increased slack of under or shuttle thread be presented to the action of the take-up so as to insure that the lock of the sewing threads will be drawn into or above the under ply of the material by the take-up when setting the stitch.

In the accompanying drawings, Figure 1 is a front side elevation of an overseaming machine embodying the present invention, the frame being shown partially in section. Fig. 2 is a crosssection of the bed-plate shown in Fig. 1 together with certain parts located below said bed-plate to be referred to hereinafter. Fig. 3 is a view in elevation of the front side of the loop-taker guide bracket, and an end view of the loop-taker driver, and the means for controlling the movements of" the loop-engaging finger. Fig. 1 is a plan view of the loop-taker driver shown in the previous figure. Fig. 5 is a rear side view of the loop-taker, together with its thread-case. Fig. 6 is a perspective view of the loop-engaging finger and its carrier. Fig. 7 is a perspective view of the loop-engaging finger controlling lever.

As the invention relates only to the construction and application of the means for controlling the slack of the under-thread, only such reference will be made to the other elements of the machine to which it is applied as is deemed necessary for a proper understanding of its application.

The frame is constructed with the usual bed-plate 1, to which is attached the bracket arm comprising the hollow standard 2 and laterally extending tubular member 3, terminating in the hollow head 1, and having journaled therein the main shaft 5 carrying the balance wheel 6.

Journaled in the bracket arm 4 in a wellknown manner is the jogging needle-bar frame 7 in which is mounted the reciprocating needle-barS carrying the needle 8. The needle-bar has fixed thereon the usual collar 10 carrying a lateral stud 11 slidably connected with one end of the pitman 12 whose opposite end is connected with the usual crank pin (not shown) carried by the takeup cam cylinder 13, the lower end of the link 12 being provided with a forwardly projecting lug 14 reciprocating within a slot 15 in plhe dguide bar 16 secured to the bracket arm The needle-bar frame carries a forked lug 17 to which is pivotally connected, by means of a screw 18, one end of a pitman 19 whose opposite end is adjustably secured by means of screw 20 and nut 21 to the vibrating segment arm 22 fulcrumed at 23 and formed in one face with a slot 24 to receive the screw 20. The arm 22 carries a stud 25 which enters a cam slot 26 in the disk 27 provided with a beveled wheel 28 meshing with a pinion 29 fixed on the main shaft 5, as represented by dotted lines, Fig. 1. Lateral jogging movements are thus imparted to the needle through the cam slot 26 in the disk 27 and connected parts.

30 represents a shaft journaled in suitable bearings carried by the machine frame and provided at its upper end with a bevel gear 31 which meshes with a like gear 32 carried by the main shaft 5, the lower end of said shaft carrying a crank disk 33 provided with a crank pin 34: operatively connected with one end of a connecting rod 35, the opposite end of said rod being suitably connected with a crank pin 36 carried by a crank arm 37 formed integral with a short shaft 38 provided with a forked arm 39, in which operatively connected at its upper end with I a feed-eccentric 45 carried by the main shaft 5, the opposite end of said connection bemg pivotally connected to a crank arm 46 carried by the feed rock-shaft 47, the latter having pivotally attached to it one end of a feed-dog-carrying bar 48 provided with a feed-dog 49, thus transmitting feed movements from the main shaft to, the feed-dog, as in earlier constructions, the elements, as 50, comprising means for controlling the amplitude of feed movement of thefeed-dog in a manner common to the present construction of feeding mechanism. I r

51 represents the feed-lift rock-shaft carrying at its forward end a crank .arm 52 provided with a roller 53 and roller stud 54 (roller and stud being shown in dotted lines only, Fig. 2), the opposite end of said rockshaft being provided with a crank arm 55 carrying a roller 56 which latter coacts with the cam portion 57 of the cam disk 58 carried by the shaft 30 to transmit vertically arranged movements to the roller 53, which latter acts against the under surface of the feed-dog-carrying bar to effect vertical movements of the feed-dog, as in earlier constructions.

The elements designated by the numeral 59 in Fig. 1 form a part of an upper feeding mechanism which is specific to the feeding of extremely heavy fabrics, and has no particular bearing on the present invention, and further reference to such elements is therefore deemed unnecessary.

Referring now to the parts more directly connected with the invention, 60 represents the loop-taker guide bracket provided with a guideway 61 in which is mounted to oscillate the loop-taker 42 carrying the threadcase 62 provided with the under thread 63, said loop-taker being held in said guideway by the employment of the usual guide ring 64 and spring cap 65, the latter being yieldingly secured by screw 66. As is well understood, the loop-taker when adjusted in operative relationship with its driver, is moved in the direction to expand the loop (as indicated by the arrow t, Fig. 3), by the wall 67 of the lug 68 of the driver 41 contacting with the heel 69 of the loop-taker, and in the opposite direction by the wall 70 of the lug 71 contacting with the wall 72 comprising the loop-taker throat.

73 represents a loop-engaging finger and 74 its carrier, the latter having formed in* tegral with it a pivot stud or rod 75 which ismounted in a suitable opening 76 (shown in dotted lines only, Fig. 3) and secured I against "accidental dis lacement by collar 77 81 represents the loop-engaging finger.

controlling lever having formed integral with it a shaft 82, which latter is loosely mounted in a suitable opening 83 (shown in dotted lines only, Fig. 4) formed in the loop-taker-driving shaft 40 and is itself provided with an opening 84 in which'is seated a spring 85, said controlling lever being provided with a step finger 86 adustably secured by screws, as 87, and with a tripping finger 88 adjustably secured by screws, as 89.

Referring more particularly to Figs. 3 and 4, which best illustrate the relative arrangement of the thread-drawing elements, supposing the loop-taker driver to occupy the position shown in Fig. 3 in its movement in the direction indicated by the arrow t, the loop-seizing point 90 of the looptaker would occupy substantially the position indicated by the arrow 8 and the other Fig. 4) against the rounded portion 93 of the step finger 86, and the finger 7 3'out of engagement with the-elongated opening 95 formed in the thread-case 62, to be referred to later.

As the loop-taker and its driver are oscillated from their positions, as indicated by the arrow '11), to their limit of oscillation in a direction opposite to that indicated by the arrow t, or in position to bring the loopseizing point 90 in line with the arrow w and ready to be advanced to seize the needlethread loop, the tripping finger 88 is brought in contact with the tripping roller 96 carried by the stud 97 secured in the back wall 98 of the loop-taker bracket 60, which causes the controlling lever 81 to be rocked in opposition to the resiliency of the spring 103 and positions the arm 91 of the loopengaging finger carrier 74 in contact with the fiattenedfportion 99 of said step finger as illustrated in Fig. 4, causing the finger 73 to enter the slot 95 in the thread case. As the loop-taker is advanced to enter the needle-thread loop, the loop-engaging finger 73 is broughtin contact with the shuttle thread, and in the further advancement of said loop-taker toward the point indicated by the arrow 8, the loop-engaging finger is caused to draw thread from the under supply until the loop-seizing point 90 arrives opposite the arrow 8, when the incline 100 stitch. 105 represents of the loop-engaging finger 7 4: contacts with the tripping roller 101 carried by the bracket 102 secured on the upper edge of the wall 98, which rocks the lever 74: on its pivot 75, thus permitting the spring 103, acting on the lug 104 of the controlling lever 81, to rock the latter and again place the arm 91 in contact with the rounded portion 93 of the step finger, thus withdrawing the finger73 out of the slot 95, which releases the under thread previously drawn from the supply by the action of the finger 7 3, and allows it to be drawn into the the opening in the thread-case through which the underthread is fed to the stitch-forming mechanism.

When it is desired to dispense with the use of the thread-drawing mechanism, the operator disconnects the thread-engaging finger 73 from its carrier 7 4:.

Having thus set forth the nature of the invention, what I claimherein is 2- 1. In a sewing machine, the combination with a needle-bar provided with a threadcarrying needle, a needle-thread take-up, a loop-taker, means for actuating said needlebar, take-up and loop-taker, and a threadcase for carrying a mass of under thread, of a loop-engaging finger controlled to place its freeend within the shell comprising said thread-case to draw thread from the supply, and means for withdrawing said free end to release tion of the take-up.

2. In a sewing machine, the combination with a needle-bar provided with a threadcarrying needle, a needle-thread take-up, a loop-taker, means for actuating said needlebar, take-up and loop-taker, and a threadcase for carrying a mass of under thread, of a loop-engaging finger having oscillatory movements in one direction to engage said thread-case to'draw thread from the supply, and in the opposite direction to release said drawn thread to the action of the take-up. V

3. In a sewing machine, the combination with a needle-bar provided with a threada needle-thread take-up, a loop-taker, means for actuating said needlebar, take-up and loop-taker, and a threadcase far carrying a mass of under thread, of a loop-engaging finger having oscillatory movements in one direction to engage said thread-case to draw thread from the supply, and in the opposite direction to release carrying needle,

Copies of this patent may be obtained for said drawn thread to the ac-- five cents said drawn thread to the action of the takeup, the oscillatory movements of said finger being in a plane substantially at right angles to the plane in which the loop-taker is actuated to form stitches.

4:- In a sewing machine, the combination with a needle-bar provided with a threadcarrying needle, a needle-thread take-up, a loop-taker, means for actuating said needle bar, take-up and loop-taker, and a threadcase for carrying a mass of under thread, of a loop-engaging finger having oscillatory movements, and means for movements including tripping members 'mounted on a stationary part of the sewing machine, the oscillatory movements of said finger in one direction causing it to engage said thread-case to draw thread from the supply, and in the opposite direction to release said drawn thread to the action of the take-up.

5. In a sewing machine, the combination with a needle-bar provided with a threadcarrying needle, and a needle-thread takeup, of a loop-taker provided with a threadcase having an elongated opening and for carrying a mass of under-thread, and a loop-taker carrier, the latter provided with a loop-engaging finger controlled to be moved into effective relationship with the elongated opening formed in said threadcase to draw thread from the supply, and in the opposite direction to release the thread drawn from said supply to the action of the take-up.

6. In a sewing machine, the combination with a needle-bar provided with a threadcarrying needle, a needle-thread take-up, a looptaker, means for actuating said needlebar, take-up and loop-taker, and a threadcase for carrying a mass of under thread, of a loop-engaging finger having oscillatory movements, and means for controlling said movements including a loop-engaging finger-controlling lever, the oscillatory movements of said finger in one direction causing it to engage said thread-case to draw thread from the supply, and in the opposite direction to release said drawn thread to the action of the take-up.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT H. DE VOE.

Witnesses:

HENRY A. KORNEMANN, J r., WM. P. STEWART.

each, by addressing the Commissioner of Patents,

Washington, D. G.

controlling said 

